An ultrasonic probe includes a shaft having a longitudinal axis and a head disposed at a distal end of the shaft. The head has a cylindrical lateral surface and an end face oriented perpendicularly to the axis. The head has three shaping surfaces at a distal end of the cylindrical surface, each shaping surface extending at an acute angle to the axis. Each of the shaping surfaces intersects or is contiguous with both the cylindrical surface and the end face.
